UN Secretary-General Ban Ki-moon condemned "in the strongest terms" the attack on civilians at the railway station in Kunming, expressing his hope that "those responsible will be brought to justice", according to a statement issued by his spokesman.

The secretary-general notes that there is no justification for the killing of innocent civilians and hopes that those responsible will be brought to justice.

The UN chief also expresses his condolences to the bereaved families and wishes those wounded a speedy recovery.

At least 29 people have been killed, and 130 injured after a group of unidentified armed men stormed into a railway station in Kunming, in China's Yunnan Province, state media agency Xinhua has reported.

Police stand near luggages left at the ticket office after a group of armed men attacked people at Kunming railway station Credit: Reuters

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An attack at a train station in south-western China was carried out by militants from China's far western region of Xinjiang, state news agency Xinhua has said.

"Evidence at the crime scene showed that the Kunming Railway Station terrorist attack was carried out by Xinjiang separatist forces," Xinhua said, citing the government of Kunming city where the attack happened.